Light earthquake, 4.1 mag was detected near Wassamu in Japan

Posted by admin on October 25, 2025 0 Comments

A light earthquake with magnitude 4.1 (ml/mb) was detected on Saturday, 8 kilometers (5 miles) from Wassamu in Japan. The epicenter of the earthquake was roughly 211.856 km (132 miles) below the earth’s surface. The 4.1-magnitude earthquake has occurred at 02:23:47 / 2:23 am (local time epicenter). Exact time and date of earthquake 04/10/25 / 2025-10-04 02:23:47 / October 4, 2025 @ 2:23 am UTC/GMT. Exact location of earthquake, 142.3158° East, 44.0321° North, depth 211.856 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Unique identifier: us6000rj67. Ids that are associated to the event: us6000rj67.

The epicenter was 29 km (18 miles) from Asahikawa (c. 356 600 pop), 63 km (39 miles) from Takikawa (c. 45 100 pop), 87 km (54 miles) from Bibai (c. 29 000 pop), 90 km (56 miles) from Mombetsu (c. 26 900 pop), 37 km (23 miles) from Nayoro (c. 26 500 pop), 55 km (34 miles) from Rumoi (c. 26 500 pop). Close country/countries that might be effected, Japan (c. 127 288 000 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Mombetsu, Bibai, Shimo-furano.

In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days two earthquakes of magnitude 3.0 or greater that has struck near. Every year there are an estimated 13,000 light earthquakes in the world. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

How would you describe the shaking?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 8 km W of Wassamu, Japan. This information comes from the USGS Earthquake Notification Service.

More information

Parameter	Value	Description
Magnitude	4.1 mb	The magnitude for the event.
Longitude	142.3158° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	44.0321° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	211.856 km	Depth of the event in kilometers.
Place	8 km W of Wassamu, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-10-04 02:23:47	Time when the event occurred. UTC/GMT
Updated	2025-10-25 01:02:57	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt		The total number of felt reports
CDI		The maximum reported intensity for the event.
MMI		The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status	reviewed	Indicates whether the event has been reviewed by a human.
Tsunami	0	This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG	259	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	us	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,us,	A comma-separated list of network contributors.
Number of Stations Used	31	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.218	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.58 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	96	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	mb	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	us6000rj67	Id of event.
Event Code	6000rj67	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000rj67,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.1 mag was detected near Wassamu in Japan

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